public class StringBufferDemo{
  public static void main(String [] args){
             StringBuffer buffer = new StringBuffer();
             buffer.append('S');
             buffer.append("tringBuffer");
             System.out.println(buffer.charAt(1));
             System.out.println(buffer.capacity());
             System.out.println(buffer.indexOf("tring"));
             System.out.println("buffer = " + buffer.toString());
         }
}